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Fixed observe to handle subresources and to always create a fake request for notify GETs

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This commit is contained in:
Joakim Eriksson 2015-05-06 18:14:29 +02:00 committed by Niclas Finne
parent ef9a36f9f6
commit 1b0cdee9ec
3 changed files with 48 additions and 18 deletions
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52
apps/er-coap/er-coap-observe.c
View file

@ -58,9 +58,9 @@ LIST(observers_list);
/*---------------------------------------------------------------------------*/
/*- Internal API ------------------------------------------------------------*/
/*---------------------------------------------------------------------------*/
coap_observer_t *
coap_add_observer(uip_ipaddr_t *addr, uint16_t port, const uint8_t *token,
size_t token_len, const char *uri)
static coap_observer_t *
add_observer(uip_ipaddr_t *addr, uint16_t port, const uint8_t *token,
size_t token_len, const char *uri, int uri_len)
{
/* Remove existing observe relationship, if any. */
coap_remove_observer_by_uri(addr, port, uri);
@ -68,7 +68,12 @@ coap_add_observer(uip_ipaddr_t *addr, uint16_t port, const uint8_t *token,
coap_observer_t *o = memb_alloc(&observers_memb);
if(o) {
o->url = uri;
int max = sizeof(o->url) - 1;
if(max > uri_len) {
max = uri_len;
}
memcpy(o->url, uri, max);
o->url[max] = 0;
uip_ipaddr_copy(&o->addr, addr);
o->port = port;
o->token_len = token_len;
@ -177,18 +182,45 @@ coap_remove_observer_by_mid(uip_ipaddr_t *addr, uint16_t port, uint16_t mid)
/*---------------------------------------------------------------------------*/
void
coap_notify_observers(resource_t *resource)
{
coap_notify_observers_sub(resource, NULL);
}
void
coap_notify_observers_sub(resource_t *resource, const char *subpath)
{
/* build notification */
coap_packet_t notification[1]; /* this way the packet can be treated as pointer as usual */
coap_init_message(notification, COAP_TYPE_NON, CONTENT_2_05, 0);
coap_packet_t request[1]; /* this way the packet can be treated as pointer as usual */
coap_observer_t *obs = NULL;
int url_len, obs_url_len;
char url[COAP_OBSERVER_URL_LEN];
PRINTF("Observe: Notification from %s\n", resource->url);
url_len = strlen(resource->url);
strncpy(url, resource->url, COAP_OBSERVER_URL_LEN);
if(strlen(url) < COAP_OBSERVER_URL_LEN && subpath != NULL) {
strncpy(&url[url_len], subpath, COAP_OBSERVER_URL_LEN - url_len);
}
/* url now contains the notify URL that needs to match the observer */
PRINTF("Observe: Notification from %s\n", url);
coap_init_message(notification, COAP_TYPE_NON, CONTENT_2_05, 0);
/* create a "fake" request for the URI */
coap_init_message(request, COAP_TYPE_CON, COAP_GET, 0);
coap_set_header_uri_path(request, url);
/* iterate over observers */
url_len = strlen(url);
for(obs = (coap_observer_t *)list_head(observers_list); obs;
obs = obs->next) {
if(obs->url == resource->url) { /* using RESOURCE url pointer as handle */
obs_url_len = strlen(obs->url);
/* Do a match based on the parent/sub-resource match so that it is
possible to do parent-node observe */
if((obs_url_len == url_len
|| (obs_url_len > url_len
&& (resource->flags & HAS_SUB_RESOURCES)
&& obs->url[url_len] == '/'))
&& strncmp(url, obs->url, url_len) == 0) {
coap_transaction_t *transaction = NULL;
/*TODO implement special transaction for CON, sharing the same buffer to allow for more observers */
@ -209,7 +241,7 @@ coap_notify_observers(resource_t *resource)
/* prepare response */
notification->mid = transaction->mid;
resource->get_handler(NULL, notification,
resource->get_handler(request, notification,
transaction->packet + COAP_MAX_HEADER_SIZE,
REST_MAX_CHUNK_SIZE, NULL);
@ -237,9 +269,9 @@ coap_observe_handler(resource_t *resource, void *request, void *response)
if(coap_req->code == COAP_GET && coap_res->code < 128) { /* GET request and response without error code */
if(IS_OPTION(coap_req, COAP_OPTION_OBSERVE)) {
if(coap_req->observe == 0) {
obs = coap_add_observer(&UIP_IP_BUF->srcipaddr, UIP_UDP_BUF->srcport,
obs = add_observer(&UIP_IP_BUF->srcipaddr, UIP_UDP_BUF->srcport,
coap_req->token, coap_req->token_len,
resource->url);
coap_req->uri_path, coap_req->uri_path_len);
if(obs) {
coap_set_header_observe(coap_res, (obs->obs_counter)++);
/*

10
apps/er-coap/er-coap-observe.h
View file

@ -43,6 +43,8 @@
#include "er-coap-transactions.h"
#include "stimer.h"
#define COAP_OBSERVER_URL_LEN 20
typedef struct coap_observable {
uint32_t observe_clock;
struct stimer orphan_timer;
@ -54,7 +56,7 @@ typedef struct coap_observable {
typedef struct coap_observer {
struct coap_observer *next; /* for LIST */
const char *url;
char url[COAP_OBSERVER_URL_LEN];
uip_ipaddr_t addr;
uint16_t port;
uint8_t token_len;
@ -68,11 +70,6 @@ typedef struct coap_observer {
} coap_observer_t;
list_t coap_get_observers(void);
coap_observer_t *coap_add_observer(uip_ipaddr_t *addr, uint16_t port,
const uint8_t *token, size_t token_len,
const char *url);
void coap_remove_observer(coap_observer_t *o);
int coap_remove_observer_by_client(uip_ipaddr_t *addr, uint16_t port);
int coap_remove_observer_by_token(uip_ipaddr_t *addr, uint16_t port,
@ -83,6 +80,7 @@ int coap_remove_observer_by_mid(uip_ipaddr_t *addr, uint16_t port,
uint16_t mid);
void coap_notify_observers(resource_t *resource);
void coap_notify_observers_sub(resource_t *resource, const char *subpath);
void coap_observe_handler(resource_t *resource, void *request,
void *response);

2
apps/rest-engine/rest-engine.c
View file

@ -126,11 +126,11 @@ rest_invoke_restful_service(void *request, void *response, uint8_t *buffer,
const char *url = NULL;
int url_len, res_url_len;
url_len = REST.get_url(request, &url);
for(resource = (resource_t *)list_head(restful_services);
resource; resource = resource->next) {
/* if the web service handles that kind of requests and urls matches */
url_len = REST.get_url(request, &url);
res_url_len = strlen(resource->url);
if((url_len == res_url_len
|| (url_len > res_url_len